Aerosol size distribution characteristics of organosulfates in the Pearl River Delta region, China
Aerosol size distribution characteristics of organosulfates in the Pearl River Delta region, China
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中国珠三角地区有机硫酸盐气溶胶粒径分布特征
DOI：
10.1016/j.atmosenv.2015.09.024
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发表时间：
2016-04-01
影响因子：
5
通讯作者：
Yu, Jian Zhen
中科院分区：
文献类型：
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作者：
Kuang, Bin Yu;Lin, Peng;Yu, Jian Zhen
有机硫酸盐(OSS)已在各种大气环境中被检测到，但其粒度分布特征尚不清楚。在这项工作中，我们研究了它们在环境气溶胶中的尺寸分布，以获得对形成过程的洞察。夏季和冬季分别在香港的一个接收点和珠江三角洲的南沙用十级撞击器采集了0.056-18微米大小分离的气溶胶样品。用电喷雾电离与Orbitrap超高分辨质谱仪联用，分离和分析了粒度分离样品中的类腐殖质。通过准确的质量测量，初步确定了类似于190个CHOCS和类似于90个CHONS的分子式为OS化合物。其中，异戊二烯、α-/β-蒎烯、柠檬烯和烷基OSS衍生的OS化合物具有较低的双键当量(DBE=0，1)和In-OSO3以外的0-2个额外氧，具有较高的强度。生物挥发性有机化合物衍生的OS公式与硫酸盐有一个共同的特征，即以液滴模式为主，峰值在0.56-1.0或1.0-1.8微米之间，反映出硫酸盐是其共同的前体。这些操作系统中的大多数都有一个次要的粗略模式，占0-45%。粗颗粒上OSS的存在被假设为小颗粒上OSS的结果(
Organosulfates (OSs) have been detected in various atmospheric environments, but their particle size distribution characteristics are unknown. In this work, we examined their size distributions in ambient aerosols to gain insights into the formation processes. Size-segregated aerosol samples in the range of 0.056-18 mu m were collected using a ten-stage impactor at a receptor site in Hong Kong in both summer and winter and in Nansha in the Pearl River Delta in winter. The humic-like substances fraction in the size-segregated samples was isolated and analyzed using electrospray ionization coupled with an Orbitrap Ultra High Resolution Mass Spectrometer. Through accurate mass measurements, similar to 190 CHOS and similar to 90 CHONS formulas were tentatively identified to be OS compounds. Among them, OS compounds derived from isoprene, alpha-/beta-pinene, and limonene and alkyl OSs having low double bond equivalents (DBE = 0,1) and 0-2 extra O beyond those in -OSO3 were found with high intensity. The biogenic volatile organic compounds-derived OS formulas share a common characteristic with sulfate in that the droplet mode dominated, peaking in either 0.56-1.0 or 1.0-1.8 mu m size bin, reflecting sulfate as their common precursor. Most of these OSs have a minor coarse mode, accounting for 0-45%. The presence of OSs on the coarse particles is hypothesized to be a result of OSs on small particle (